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rinclusive, the resistance-cards 14 are formed heretofore described iniflat form 4heretofore structed -f-in other '1.51 ends abutting at thecenter of the n the shape of a broad V lengthwise by bending.

since the mass can be-packed solidly to ether,

so as .to look the resistance-cards, & into one another, and therebyforni-a structure is more rigid than in the case ofthe described, Figs.1, 2, These resistance-cards 14 are con- -similarly totheresistance-cards et respects than 'thisV shape, and are in two blocks orsets having their which arranged The resistance -cards connection withFigs. 1,' 2, 3, &c., are similarly arranged in two blocks with abuttinginner ends. he conductors 3v are provided with loose ends lof `as'shownin Fig. 8.

. slliiicient. length to join the next oradjacent the rheostat.

resistance-card and also make any -connection to the contact points orThe construction, heretofore described, of the renecessarysistance-cards is that these' loose ends 15 are grouped at the center ofthe rheostat, as shown inv Fig. 8, thereby making it more convenient 'toarrangethe to the contact-points 16. These loose ends 15 beinginconnections and secure them (Shown in Fig. l.) the irst place bare ofinsulation are covered and insulated from each otherl by having tubes ofasbestos cloth I cation of silicate 'of soda.

posts of the switch or other suitable insulating material slipped loverthem and secured in place by the appli- The ends'of the conductors maybe connected together by any v"suitable mechanical means o'r by'anelectric or other vWelding process, and they may be connected to thebuttons, studs, or bindingusual manner. Y

17 indicates the usual form of switch mounted in the center of the boardor top 18 of the rheostat, and having contact-points 16.

therefore be heated to a temperature I t will thus be seen that bymea-'ns of this structure herein set out the several resistancecards,radiating, Ventilating, and supporting plates may be securely andrigidly held together bycompression and that parts of them may beremoved by releasing the nuts and rods and compression-plates.

A feature of this rheostat is that it contains no carbonizable materialand that no soft solder is necessary in its construction. lt may limitedonly by the oxidation of the German dac., or the metal forming theconductors.

Vhat I claim is- 1. A resistance-card for rheostats, consisting ofinsulating material Wound with a lnetallic'conductor, and folded uponitself lengthrheosta't,

wise so as to bring theends of the conductor at one end of the card.

2. A resistance-card )with a metallic folded upon itself lengthwise, theends of the conductor .being located at one end of the resistance-card.

3. Ares'istance-card for rheostats, lating material Wound with ametallic conductor and having a broad V shape lengthwise. 4

f4. A resistancecard ing of a flattened tube Wound spirally-With afolded upon itself lengthwise,and being of a broad V shape throughoutitsjlength.

5. In a rheostat, i

of layers of insulating material woundwith metallic conductors,radiating-plates interfor rheostats, consistof insulating materialplates of Y advantage of this folded by screw contact in they polatedbetween thel resistance-cards, comsliding contact with the silver,

polated between theresistance-cards, compression-plates between whichthe radiatingplates and the resistance-cards are located,

of 'insufor 1hcos'tats,co11sist 1mg of a tube of lnsulating materialWound conductor and flattened and metallic conductor and vresistance-cards formed and means for compressing and securing the'resistance-cards and radiating-plates be tween .thecompression-plates,substantially as set' 6.'A resistance-card formed .oflayers voi insulating niaterialwound'with metallic conductors,radiatingplates *interpolatedv between the resistance-cards,Ventilating-plates interpolated between the resistance-cards,compression-plates 'between which saidv resistance-cards,radiating-plates and ventilating-plates are located, and means fortightening and-securing saidfseveral plates between thecompression-plates.

` 7. Infa rheostat,

resistance-cards"formed of layers of insulating material wound withmetallic con ductors, radiating-plates interposupport- -lated betweenthe resistance-cards, ing-plates and Ventilating-plates alsointerpression-plates between which said several plates are located, andmeans for securing and compressing said 4several plates between I rolthe compression-plates, substantially as s et 1 forth.

8. A Ventilating-plate for rheostats, consisting of pairs of metallicplates coated with insulating material and secured together and heldapart, by spacing-blocks. f 9. A resistance-card ing of layers ofinsulating material Wound with metallic conductors and folded lengthreoWise, the conductors having loose ends cov- IIS? for rheostats,consist Iered and insulated from each other,and secured in place by silicate of;soda. lIn Witness whereof I have hereunto hand this 10th day ofDecember, 1895. p

set my l

